US20160195801A1 - Projector - Google Patents

Projector Download PDF

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Publication number
US20160195801A1
US20160195801A1 US14/981,968 US201514981968A US2016195801A1 US 20160195801 A1 US20160195801 A1 US 20160195801A1 US 201514981968 A US201514981968 A US 201514981968A US 2016195801 A1 US2016195801 A1 US 2016195801A1
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United States
Prior art keywords
plane
projector
light
prism
mirror device
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
Application number
US14/981,968
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English (en)
Inventor
Chih-Shiung Chien
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Qisda Optronics Suzhou Co Ltd
Qisda Corp
Original Assignee
Qisda Optronics Suzhou Co Ltd
Qisda Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Qisda Optronics Suzhou Co Ltd, Qisda Corp filed Critical Qisda Optronics Suzhou Co Ltd
Assigned to QISDA CORPORATION, QISDA OPTRONICS (SUZHOU) CO., LTD. reassignment QISDA CORPORATION ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: CHIEN, CHIH-SHIUNG
Publication of US20160195801A1 publication Critical patent/US20160195801A1/en
Abandoned legal-status Critical Current

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    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/14—Details
    • G03B21/20—Lamp housings
    • G03B21/2066—Reflectors in illumination beam
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/005—Projectors using an electronic spatial light modulator but not peculiar thereto
    • G03B21/008—Projectors using an electronic spatial light modulator but not peculiar thereto using micromirror devices

Definitions

  • the present invention illustrates a projector, and more particularly, the projector with two-axis tilting digital micro-mirror device.
  • the conventional projector can project micro-images to a huge screen by a digital micro-mirror device (DMD). Further, since the conventional projector provides sufficient brightness, the image data can be displayed and then shared to everyone.
  • DMD digital micro-mirror device
  • FIG. 1 illustrates a structure of a conventional projector 50 .
  • the conventional projector 50 includes a digital micro-mirror device 10 , a total internal reflection (TIR) prism set 11 , a reflecting mirror (reflector) 12 , a lens module 13 , and a light pipe 14 .
  • TIR total internal reflection
  • the viewing direction on X-axis is a direction from an origin point to the right side.
  • the viewing direction on Y-axis is a direction from the origin point to the underside.
  • the viewing direction on Z-axis is an incident direction on X-Y plane.
  • an incident light passes the lens module 13 through the light pipe 14 and is reflected to the TIR prism set 11 by the reflecting mirror 12 . Finally, the incident light is reflected as an image light by the digital micro-mirror device 10 and then projected to the screen.
  • the digital micro-mirror device 10 can only receive the incident light with oblique incident direction because of the physical limitation of the digital micro-mirror device 10 .
  • the disposition between the TIR prism set 11 and the digital micro-mirror device 10 introduces an inclination angle (i.e., such as 45 degrees of angle).
  • the volume of the conventional projector 50 is bounded by the inclination angle. Since the volume reduction is the major issue of the projector design, conventional projector 50 with big volume becomes inconvenient and thereby losses of competitiveness.
  • a projector in an embodiment of the present invention, includes a light source, a digital micro-mirror device, a lens, a first prism, and a second prism.
  • the light source is used for emitting an incident light.
  • the digital micro-mirror device has a first side in a first direction and a second side in a second direction perpendicular to the first direction, wherein the first side is longer than the second side, the digital micro-mirror device receives and reflects the incident light as an image light, and the image light is transmitted along a third direction perpendicular to the first direction.
  • the lens is used for receiving and projecting the image light.
  • the first prism is disposed between the light source and the digital micro-mirror device for receiving and transmitting light.
  • the first prism includes a first plane, a second plane, and a third plane.
  • the first plane facing the light source is used for receiving the incident light.
  • the second plane is adjoined the first plane for reflecting the incident light to the digital micro-mirror device.
  • the third plane is parallel to the digital micro-mirror device and is adjoined the first plane by an adjoining side, wherein the adjoining side is parallel to the first side.
  • the second prism is disposed between the first prism and the lens for receiving and transmitting the image light.
  • the second prism includes a fourth plane and a fifth plane.
  • the fourth plane is parallel to the second plane.
  • the fifth plane is adjoined the fourth plane and faces the lens.
  • FIG. 1 illustrates a structure of a conventional projector.
  • FIG. 2 illustrates a structure of a projector according to the embodiment of the present invention.
  • FIG. 3 illustrates a structure of two prisms of the projector in FIG. 2 according to the embodiment of the present invention.
  • FIG. 4 illustrates a side view of the projector in FIG. 2 according to the embodiment of the present invention.
  • FIG. 5 illustrates a simulation result of light paths of a projector according to another embodiment of the present invention.
  • FIG. 2 illustrates a structure of a projector 100 according to the embodiment of the present invention.
  • the projector 100 includes a digital micro-mirror device 20 , a lens module 21 , a light pipe 22 , a light source 23 , a lens 24 , a first prism S 1 , and a second prism S 2 .
  • the light source 23 is used for emitting an incident light A.
  • the digital micro-mirror device 20 is a rectangular-shaped flat device. Specifically, the digital micro-mirror device 20 has a plurality of micro-mirrors for reflecting the incident light A to an image light B.
  • the digital micro-mirror device 20 has a long side C in a first direction and a short side D in a second direction perpendicular to the first direction (i.e., see FIG. 4 ).
  • the digital micro-mirror device 20 is a two-axis tilting digital micro-mirror device (i.e., TRP (Tilt & Roll Pixel) DLP® PicoTM chipset).
  • TRP tilt & Roll Pixel
  • all micro-mirrors can be tilted to ON-state and OFF-state. When the micro-mirrors are operated on ON-state, each micro-mirror is sequentially tilted 12 degrees on two diagonal axes.
  • the incident light A is reflected as the image light B with 34 ⁇ 36 degrees of angle equivalently.
  • the lens 24 is used for receiving the image light B.
  • the first prism S 1 and the second prism S 2 are disposed among the lens module 21 , the digital micro-mirror device 20 , and the lens 24 for receiving the incident light A from the lens module 21 , reflecting the incident light A to the digital micro-mirror device 20 , and transmitting the image light B to the lens 24 .
  • the incident light A is transmitted to the lens module 21 through the light pipe 22 .
  • the incident light A is further transmitted to the first prism S 1 along a light path L 1 .
  • the incident light A is reflected (i.e., total internal reflection) to the digital micro-mirror device 20 along a light path L 2 inside the first prism S 1 .
  • the micro-mirror device 20 reflects the incident light A as the image light B.
  • the image light B is transmitted back to the first prism S 1 along a light path L 3 .
  • the image light B passes through the first prism S 1 and the second prism S 2 progressively and is transmitted to the lens 24 along a light path L 4 .
  • the detailed expression of light transmission process is illustrated later. For illustrating viewing direction explicitly, 3 perpendicular axes of Cartesian coordinate are represented on the upper right hand side in FIG. 2 .
  • the viewing direction on X-axis is an incident direction on Y-Z plane.
  • the viewing direction on Y-axis is a direction from an origin point to the upside.
  • the viewing direction on Z-axis is a direction from the origin point to the left side.
  • a space exists between the first prism S 1 and the second prism S 2 .
  • Another space also exists between the first prism S 1 and the digital micro-mirror device 20 .
  • two spaces are introduced in this embodiment, the present invention is not limited by the two spaces.
  • no space is introduced between the first prism S 1 and the second prism S 2 , and between the first prism S 1 and the digital micro-mirror device 20 .
  • the structure of the first prism S 1 and the second prism S 2 in the projector 100 and the light transmission process are illustrated below.
  • FIG. 3 illustrates a structure of the first prism S 1 and the second prism S 2 in the projector 100 according to an embodiment of the present invention.
  • the first prism S 1 is a triangular prism with 5 planes.
  • the first prism S 1 includes a first triangular plane TP 1 , a second triangular plane TP 2 , a first plane P 1 , a second plane P 2 , and a third plane P 3 .
  • a first angle A 1 is located between the first plane P 1 and the second plane P 2 .
  • a second angle A 2 is located between the second plane P 2 and the third plane P 3 .
  • a third angle A 3 is located between the third plane P 3 and the first plane P 1 .
  • the third angle A 3 is greater than the first angle A 1 and the second angle A 2 .
  • the first angle A 1 can be 52.31 degrees.
  • the second angle A 2 can be 29.50 degree.
  • the third angle A 3 can be 98.19 degree.
  • the second prism S 1 is also a triangular prism with 5 planes.
  • the second prism S 2 includes a third triangular plane TP 3 , a fourth triangular plane TP 4 , a fourth plane P 4 , a fifth plane P 5 , and a sixth plane P 6 .
  • a fourth angle A 4 is located between the fourth plane P 4 and the fifth plane P 5 .
  • a fifth angle AS is located between the fourth plane P 4 and the sixth plane P 6 .
  • a sixth angle A 6 is located between the fifth plane P 5 and the sixth plane P 6 .
  • the fourth angle A 4 can be equal to the second angle A 2 .
  • the fourth angle A 4 can be 29.50 degrees.
  • the fifth angle AS can be 95.50 degrees.
  • the sixth angle A 6 can be 55.50 degrees.
  • the first prism 51 and the second prism S 2 have to satisfy the following conditions.
  • the third plane P 3 of the first prism 51 is parallel to the fifth plane P 5 of the second prism S 2 .
  • the second plane P 2 of the first prism S 1 is parallel to the fourth plane P 4 of the second prism S 2 .
  • the third plane P 3 of the first prism S 1 is parallel to the digital micro-mirror device 20 in FIG.
  • the adjoining side E is introduced between the third plane P 3 and the first plane P 1 of the first prism S 1 . Specifically, the adjoining side E is parallel to the digital micro-mirror device 20 (i.e., on X-axis).
  • the light pipe 22 receives the incident light A emitted from the light source 23 .
  • the light pipe 22 can be a wedge-shaped light pipe.
  • the wedge-shaped light pipe is defined that the measure of caliber for receiving the incident light A is greater than the measure of caliber for outputting the incident light A.
  • the incident light A passes through the light pipe 22 and the lens module 21 progressively.
  • the function of the lens module 21 is used for concentrating the beam from the incident light A by light focusing characteristics. By doing so, the incident light A can be projected on the digital micro-mirror device 20 precisely.
  • the lens module 21 comprises at least one lens.
  • An equivalent focal length of the lens module 21 may be 80 mm ⁇ 82 mm.
  • the incident light A passes through the lens module 21 and then reaches to the first plane P 1 of the first prism S 1 in accordance with vertical incidence.
  • the transmitted direction of the incident light A is parallel to the direction of a normal vector of the first plane P 1 .
  • the incident light A is transmitted along the light path L 1 inside the first prism S 1 . Then, the incident light A is reflected by the second plane P 2 of the first prism S 1 .
  • the reflection is a total internal reflection so that the incident light A is transmitted back to the same medium (i.e., the first prism S 1 ) after the incident light A is reflected by the second plane P 2 . Then, the incident light A is transmitted along the light path L 2 . Finally, the incident light A reaches the digital micro-mirror device 20 by passing off the third plane P 3 of the first prism S 1 .
  • the digital micro-mirror device 20 has the long side C on X-axis and the short side D on Y-axis.
  • the adjoining side E between the third plane P 3 and the first plane P 1 of the first prism S 1 is parallel to the long side C of the digital micro-mirror device 20 .
  • the beam of the incident light A being transmitted to the digital micro-mirror device 20 on X-Y plane can be regarded as the beam of the incident light A being transmitted to the long side C of the digital micro-mirror device 20 (see FIG. 4 ) without any additional inclination angle (i.e., a straight line in FIG. 4 ).
  • the digital micro-mirror device 20 is a two-axis tilting digital micro-mirror device (i.e., TRP (Tilt & Roll Pixel) DLP® PicoTM chipset)
  • each micro-mirror can be sequentially tilted 12 degrees on two diagonal axes.
  • the incident light A is transmitted to the digital micro-mirror device 20 along the light path L 2 , the incident light A is reflected as the image light B with 34 ⁇ 36 degrees of angle therebetween.
  • the image light B is transmitted along the light path L 3 and then passes off the third plane P 3 and the second plane P 2 of the first prism S 1 .
  • the light path L 3 may be perpendicular to the third plane P 3 .
  • the image light B is refracted by a space (air) between the first prism S 1 and the second prism S 2 . Then, the image light B passes off the fourth plane P 4 and the fifth plane P 5 of the second prism S 2 along the light path L 4 .
  • the fifth plane P 5 of the second prism S 2 is parallel to the third plane P 3 of the first plane S 1 .
  • the light path L 4 is parallel to the light path L 3 .
  • the image light B is perpendicularly transmitted to the fifth plane P 5 of the second prism S 2 .
  • the image light B passes through the fifth plane P 5 without any reflection.
  • the image light B is received by the lens 24 .
  • the range of the digital micro-mirror device 20 for receiving the incident light A to the range of the light pipe 22 ratio is about 1.65 ⁇ 1.85.
  • the magnification of an optical mechanical system formed by the light pipe 22 , the lens module 21 , the prisms S 1 ,S 2 , and the digital micro-mirror device 20 is about 1.65 ⁇ 1.85.
  • the aperture of the lens 24 is F1.7.
  • the present invention is not limited by the specific projective magnification and aperture.
  • the magnification and the aperture can be any values in other embodiments.
  • FIG. 4 illustrates a side view of the projector 100 in FIG. 2 according to an embodiment of the present invention.
  • the side view of the projector 100 includes a total internal reflection (TIR) prism set 25 , a digital micro-mirror device 20 , a lens module 21 , and a light pipe 22 .
  • TIR total internal reflection
  • 3 perpendicular axes of Cartesian coordinate are represented on the upper right hand side in FIG. 4 .
  • the viewing direction on X-axis is a direction from an origin point to the left side.
  • the viewing direction on Y-axis is the direction from the origin point to the upside.
  • the viewing direction on Z-axis is an incident direction on X-Y plane.
  • the structure of the TIR prism set includes the first prism S 1 and the second prism S 2 illustrated in FIG. 3 .
  • the digital micro-mirror device 20 is a two-axis tilting digital micro-mirror device (i.e., TRP (Tilt & Roll Pixel) DLP® PicoTM chipset).
  • TRP tilt & Roll Pixel
  • the adjoining side E between the third plane P 3 and the first plane P 1 of the first prism S 1 is parallel to the long side C of the digital micro-mirror device 20 (see FIG. 3 and FIG. 4 ).
  • the incident light A is transmitted to the long side C of the digital micro-mirror device 20 on X-Y plane.
  • FIG. 5 illustrates a simulation result of the incident light A of a projector 200 according to another embodiment of the present invention.
  • the structure of the projector 200 includes a TIR prism set 25 , a digital micro-mirror device 20 , a lens module 21 , a light pipe 22 , and a reflector 26 .
  • the projector 200 is similar to the projector 100 .
  • the reflector 26 is introduced in the projector 200 for reflecting the incident light A from the lens module 21 to the TIR prism set 25 .
  • the volume of the projector 200 can be further reduced.
  • 3 perpendicular axes of Cartesian coordinate are represented on the upper left hand side in FIG. 5 .
  • the viewing direction on X-axis is an incident direction on Y-Z plane.
  • the viewing direction on Y-axis is a direction from an origin point to the upside.
  • the viewing direction on Z-axis is a direction from the origin point to the left side.
  • the incident light A is transmitted to the lens module 21 through the light pipe 22 .
  • the lens module 21 concentrates the beam from the incident light A and then transmits the incident light A to the digital micro-mirror device 20 according to the light paths illustrated in FIG. 2 and FIG. 5 .
  • some light leakage may occur during the imaging and reflecting process. However, comparing with the incident light A, the intensity of light leakage is minor and can be ignored.
  • a projector is disclosed in the present invention.
  • the idea is to use a two-axis tilting digital micro-mirror device for volume reduction. By doing so, no additional inclination angle is required between the TIR prism set and the digital micro-mirror device of the projector. As a result, the volume of the projector in the present invention can be reduced, thereby increasing the convenience.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Projection Apparatus (AREA)
US14/981,968 2015-01-07 2015-12-29 Projector Abandoned US20160195801A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
TW104100446 2015-01-07
TW104100446A TWI575297B (zh) 2015-01-07 2015-01-07 投影機

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Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20050046806A1 (en) * 2003-08-26 2005-03-03 Sean Chang Illumination system for projector and illumination method thereof
US20060103812A1 (en) * 2004-11-15 2006-05-18 Young Optics Inc. Projection display system
US20060221258A1 (en) * 2005-03-30 2006-10-05 Samsung Electronics Co., Ltd. Projection TV
US7518803B2 (en) * 2005-07-25 2009-04-14 Konica Minolta Opto, Inc. Dichroic prism, and prism unit and image projection apparatus employing same
US20090262311A1 (en) * 2008-04-18 2009-10-22 Ming-Kuen Lin Projector with reduced size and higher contrast
US20100118213A1 (en) * 2007-04-23 2010-05-13 Panasonic Corporation Projection display device
US8469516B2 (en) * 2009-06-24 2013-06-25 Sanyo Electric Co., Ltd. Illumination apparatus and projection display apparatus
US20140340650A1 (en) * 2013-05-17 2014-11-20 Texas Instruments Incorporated Color display projection method and apparatus
US20150042564A1 (en) * 2012-03-14 2015-02-12 Sharp Kabushiki Kaisha Projector

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TWI227791B (en) * 2003-10-06 2005-02-11 Delta Electronics Inc Reflective projection display system
JP4063213B2 (ja) * 2003-12-09 2008-03-19 カシオ計算機株式会社 光源装置及びそれを備えたプロジェクタ
CN101140406B (zh) * 2006-09-05 2012-03-21 三洋科技中心(深圳)有限公司 投影装置及其影像合成装置

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20050046806A1 (en) * 2003-08-26 2005-03-03 Sean Chang Illumination system for projector and illumination method thereof
US20060103812A1 (en) * 2004-11-15 2006-05-18 Young Optics Inc. Projection display system
US20060221258A1 (en) * 2005-03-30 2006-10-05 Samsung Electronics Co., Ltd. Projection TV
US7518803B2 (en) * 2005-07-25 2009-04-14 Konica Minolta Opto, Inc. Dichroic prism, and prism unit and image projection apparatus employing same
US20100118213A1 (en) * 2007-04-23 2010-05-13 Panasonic Corporation Projection display device
US20090262311A1 (en) * 2008-04-18 2009-10-22 Ming-Kuen Lin Projector with reduced size and higher contrast
US8469516B2 (en) * 2009-06-24 2013-06-25 Sanyo Electric Co., Ltd. Illumination apparatus and projection display apparatus
US20150042564A1 (en) * 2012-03-14 2015-02-12 Sharp Kabushiki Kaisha Projector
US20140340650A1 (en) * 2013-05-17 2014-11-20 Texas Instruments Incorporated Color display projection method and apparatus

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TWI575297B (zh) 2017-03-21
TW201626092A (zh) 2016-07-16

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Owner name: QISDA CORPORATION, TAIWAN

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:CHIEN, CHIH-SHIUNG;REEL/FRAME:037370/0972

Effective date: 20151215

Owner name: QISDA OPTRONICS (SUZHOU) CO., LTD., CHINA

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:CHIEN, CHIH-SHIUNG;REEL/FRAME:037370/0972

Effective date: 20151215

STCB Information on status: application discontinuation

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